Police have arrested five people allegedly involved in a major drug supply syndicate in New South Wales.

Early this morning 50 police officers from Strike Force Emily raided houses in New Lambton, Macquarie Hills, Warners Bay and Cardiff in the Newcastle and Lake Macqaurie regions.

They arrested four people and seized drugs, $40,000 in cash and two cars.

Police allege the syndicate was supplying ice, amphetamines, ecstasy and cocaine in the Hunter Valley, mid north coast and central west regions of the state.

The arrested will all appear in court this afternoon charged with possessing and supplying drugs.

Another man was arrested at Williamtown airport.

Police allege he was one of the main ring leaders of the group.

Police say since their surveillance operation began in July last year they have made 13 arrests.

AUSTRALIAN rugby league great Andrew Johns has confirmed he was issued with a caution for possession of an ecstasy tablet in London last Sunday.

Johns was arrested but not charged by British transport police, who apparently were conducting a routine search at underground railway stations following the annual Notting Hill Carnival, a statement from Johns’ management The Fordham Company said.

"Following an interview with police he was told the misdemeanour did not warrant being charged and instead was given an official caution," the statement said.

"Johns said today he recalled an unknown person pushing a tablet into his jeans at a crowded entertainment venue last Sunday – his last day in the United Kingdom following a six weeks overseas holiday."

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n the statement, Johns said: "I was having such a good time, seeing it was the last day before I flew home.

"I stupidly forget about the tablet and instead of getting rid of it I left myself in a situation I soon deeply regretted.

"I have been a very foolish person and realise I have brought great disappointment to my family, friends and many people, including lots of youngsters who have looked up to me over the years. It has left a black mark on my reputation which I will work very hard at erasing".

Johns was one of 206 people arrested for drugs possession in London over the British holiday weekend.

A British Transport Police spokeswoman said late last night: "A man in his 30s was arrested and cautioned for possession of an ecstasy tablet following a routine police operation at King’s Cross underground station at 4.20pm on Sunday, 26th of August."

Johns, who was forced out of the game in April by a recurring neck injury, has been holidaying in Europe and the UK.

He and injured Brisbane Broncos skipper Darren Lockyer were guests at the Challenge Cup final between St Helens and Catalans at Wembley Stadium the day before his arrest.

He had been in London for a few weeks and had accepted an invitation by former Newcastle Knights player Billy Peden to pass on his tactical and kicking knowledge at the Harlequins Rugby League Club.

Johns has also been working with the Wallabies ahead of the World Cup.